38723688 has 72 divisors (see below), whose sum is σ = 111468630. Its totient is φ = 12142080.

The previous prime is 38723687. The next prime is 38723689. The reversal of 38723688 is 88632783.

It is an interprime number because it is at equal distance from previous prime (38723687) and next prime (38723689).

It can be written as a sum of positive squares in 3 ways, for example, as 30669444 + 8054244 = 5538^2 + 2838^2 .

It is a tau number, because it is divible by the number of its divisors (72).

It is not an unprimeable number, because it can be changed into a prime (38723687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 19878 + ... + 21738.

Almost surely, 2^38723688 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 38723688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (55734315).

38723688 is an abundant number, since it is smaller than the sum of its proper divisors (72744942).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

38723688 is a wasteful number, since it uses less digits than its factorization.

38723688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1907 (or 1883 counting only the distinct ones).

The product of its digits is 387072, while the sum is 45.

The square root of 38723688 is about 6222.8360094092. The cubic root of 38723688 is about 338.3183630176.

The spelling of 38723688 in words is "thirty-eight million, seven hundred twenty-three thousand, six hundred eighty-eight".